Small volume ion chamber



FIG. 1 is a top, front perspective view of a small volume ion chamber showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof, the rear and side views being identical thereto; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a small volume ion chamber, as shown and described. 